were there any actual explanation about the "ultimate selves"? i mean any foreshafowing stuff earlier in the comic or anything? i remember john talkin other selves in one upd8. it seemed like something important and it could be still (epilogue)

Nothing out right, but there are some examples earlier on like Jade and Jadesprite interaction, or Dirk comparing himself to Bro. Here’s a really good analysis/theory on ultimate selves if you’re interested.